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得噪音系数为NF (
2Uno 4kTBR0
Psmi
Psmo
RsR1
R2 R3 RR R1
0 s
R1 Rs
R Rs R13
2
R RR (R2 R3)(Rs R1)
0 s1 Rs R1R3 1 R1Rs R2Rs R1R2 RsR0 R1
2)采用开路电压法
Unio
R R31 4kTBRs
R1Rs R1 Rs
R R23 R1 Rs
R R01 4kTBRs